Scissors sharpener



Sept. 22, 1925.

J- SKARKA SCISSORS SHARPENER Filed Feb. 2 1923 2 Sheets-Sheet 1 Sept. 22, 1925.

,1. SKARKA sclssonssnlmrzma Filed Feb. 27, 1925 .2 Shuts-Sheet 2 Patented Sept. 22, 1925.

JOSEPH. sxaaKA, or cmcaeo; rnmnors.

s'dissons. siianrnnnn. A

Application filed February 27, 1923. Serial a... 621,576,

To all whom it may concern:

Be it known that I, JOSEPH SKARKA, a citizen of the Republic of Czechoslovakia, residing. at Chicago, in the county of Cook wand; State of Illinois, have invented new :anduse-ful Improvements in Scissors Sharp- ,eners,.of which-the following is aaspecification. V 2 Thisinvention relates to sharpening or grinder devices, but has particular reference to scissor grinders, and has among its objects the provision of a simple, portable device which shall be inexpensive to manufacture and efficient in operation.

It is also an object of the invention to provide such device with a grind stone which is laterally adjustable to compensate for its wear and to accommodate varying thicknesses in shear blades.

A still further object resides in the provision of a resiliently, and pivotally mounted retainer, which retains the shear blade by a two point contact against the stone.

With these and other objects in view, my invention consists in the novel combina tionof parts or members illustrated in the accompanying drawings, described in' the following specifications and particularly pointed out in the appended claim.

Referring to the drawings: Figure 1 is an elevation of a sharpening device embodying my invention, and Figure 2 is a plan view thereof. Figure 3 is a section taken on line 33 of Figure 2, showing the slightly elongated bore in the bearing for the grind stone shaft. Figure 4: is a section taken on line 4% of Figure 2, showing the adjustable retaining yoke for the grin-dstone shaft. Figure 5 is a section taken on line 5-5 of Figure 2, showing the other shaft bearing and the relative mounting of the grindstone and shear blade retaining slot. Figure 6 is a section taken on line 6-6 of Figure 2, showing the pivotal mounting of the springpressed shear blade retainer.

Referring to the drawings, which illustrate one embodiment of my invention: 10 indicates generally a frame, cast of any suitable metal and comprising an adjustable screw clamp 11 supported by the integral arm 10*. The clamp 11 is situated directly under the bracket 10 from which extend the upwardly disposed integral arms 10 and the integral driving gear support 10. he tim -S e ne nlatferm 19 i cas bores respectively li 13 to afford the lateral adjustment of same integrally with and at right angles to the arms 1.0 and support 10 The grindstone 12 is rigidly mounted to theend of; the shaft 13v which is mounted for rotation in the elongated bores of the bearings 14 and 15 which arecast integrally with the platform 10 A pair of collars 16 retain the shaft against movement along 1 its longitudinal axisand also maintain the pinion 17 at the end thereof, in aligned operative contact with its teeth, meshing within the spaced circular openings 18*, arranged circumferentially of the driving disk 18. The driving disk 18 is provided with a suitable handle 19 for manual opera tion and is rotatably mounted on the pin 20 which is supported in the support 10.

The bearings 14 and 15 have elongated and 15 for the shaft when the stone 12 wears in use. The shaft 13 is, however, held in relatively fixed position by the yoke 21 which is laterally movable by the rotation of the screw 22 the head of which is loosely mounted in the support 10.

The bearings 14 and 15 are provided with integral extensions 14 and 15 having re spectively slots 14 and 15 for retaining shear blades of varying thicknesses against vertical movement during sharpening. As a further retaining means for the shear blade, an arm 23 is povitally mounted on pin 24 and normally pressed by the spring 25 toward the grindstone. The free end of this arm 23 is provided with a slot 23 for the pivotal pin 26 to which is mounted, the two point retainer 27 This retainer 27 is situated above the platform 10, is of L cross-section and curved in the outer end so that the two ends form the sole bearing points on the blade, X as it is held in the wedge-like groove 15 (see Figure 2). The vertical leg 27 affords a widebearing sur face for the shear blade X. The lateral leg 27 is formed with a downwardly disposed integral portion 27 which extends through the slot 10 within the platform 10 The portion 27 has a lateral integral extension at its lower end to which the pivotal pin 26 is riveted.

In operation, the shear blade X which is to be sharpened, is placed within the wedge-like grooves 141- and 15 with the spring press d w th??? 2? ag inst the b a;

above described, the driving 'disk 18 is then rotated which will rot-ate the stone 12 through the operation of the shaft 13 and pinion 17. During thisop eration, the blade Y is gradually moved longiti'idinailly to afford the contact and sharpening of the full length of the blade. I

I claim: In a grinding device, the combination of a shaft, a gl'indrstfone motu 'ted ,on "said shaft, a pinion mounted on said shaft, {driving member for said pinion, said shaft being mounted for slight radial movement about said pinion, means for retaining a blade in relative operative position to said grindstone comprising a stationary Wedge abutment and a spring-pressed pivotally mounted retainer having a slotted opening at its outer end and carrying Within said slotted opening a loosely mounted arm, said arm having a two-point contact on said blade, the vertical center line of the grinding face of the stone being between said "two points 'of contact, and the center of the rotary axis of said grind-stone being relatively arranged above the edgeof said blade to provide an edge on said blade having a cross-section of an inclined arcuate configuration.

In Witness whereof I afiix my signature.

JOSEPH SIQARKA. 

